Question

An hour of CFL use consumes 10-2 kWh (kilowatt – hour), if each kilowatthour of electricity use is equivalent to 3.6 X 106 joules of energy, then find out the energy in joules used by the CFL in one hour

Answer 1

`3.6*10^(4)\ joules` or
`36,000\ joules`

Explanation:

Let

x -----> the energy in joules used by the CFL in one hour

we know that

using proportion

`(1)/(3.6*10^(6))(kWh)/(joules) =(10^(-2))/(x)(kWh)/(joules)\\ \\x=(3.6*10^(6))(10^(-2))\\ \\x=3.6*10^(4)\ joules`

or

`36,000\ joules`